the number of trailing zeros in a factorial of a given number - Ruby

Question

Having a little trouble trying calculate the number of trailing zeros in a factorial of a given number. This is one of the challenges from Codewars- can\'t get mine to pass.

Answer 1

count = 0
i  =5
n = 100
k = n

while(n/i!=0):
    count+=(n/i)
    i=i*5
    n = k
print count